Solid Electrolytic Capacitor with Conductive Polymer Composite
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Solution Overview
Problem
Existing solid electrolytic capacitors face issues with high equivalent series resistance (ESR) and reduced capacitance at high temperatures due to low conductivity of manganese oxide-based conductive layers and inefficient polymerization methods, leading to decreased performance and stability.
Innovation Solution
A solid electrolytic capacitor design incorporating a conductive complex of cationized conductive polymer and polymer anion, combined with a first hydroxy compound having four or more hydroxy groups and a second hydroxy compound with an amino group and one or more hydroxy groups, to form a solid electrolyte layer with improved conductivity and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive layer composed of manganese oxide is formed using electrolytic polymerization method, then the capacitor structure is established, but the conductivity is low and the manufacturing process becomes complicated
Solution Approach 1:
The patent changes the chemical composition parameters of the conductive layer by replacing manganese oxide with conductive polymers (polyaniline, polypyrrole, polythiophene) and their derivatives. This substitution maintains the conductive function while simplifying the manufacturing process and improving conductivity, directly resolving the contradiction between structural stability and manufacturing complexity
Solution Approach 2:
The patent employs conductive polymers that can be easily deposited and formed through simple coating and drying processes, replacing the complex electrolytic polymerization method. These polymer-based conductive layers achieve comparable or superior performance with significantly reduced manufacturing complexity
2Ease of manufacture
If conventional solid electrolyte compositions are used, then the capacitor can be produced, but the equivalent series resistance is high and temperature stability is poor
Solution Approach 1:
The patent creates composite solid electrolyte systems by combining conductive polymers with specific hydroxy compounds (having four or more hydroxy groups) and amino-alcohol compounds. This composite approach enhances the temperature stability and reduces ESR while maintaining ease of manufacture through solution-based deposition methods
Solution Approach 2:
The patent introduces hydroxy compounds and amino-alcohol compounds as intermediary substances that mediate between the conductive polymer and the capacitor structure. These intermediaries improve the overall temperature stability and conductivity of the solid electrolyte layer without complicating the manufacturing process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution results in a capacitor with low ESR, high heat resistance, and excellent temperature stability, enabling efficient production of capacitors with enhanced performance characteristics.
Implementation Method 1
chemical oxidation polymerization methods in which a precursor monomer which forms a conductive polymer is polymerized using an oxidizing agent
Implementation Method 2
the solid electrolyte layer includes at least a conductive complex (a) of a cationized conductive polymer and a polymer anion
Implementation Method 3
a first hydroxy compound (b) having four or more hydroxy groups and a second hydroxy compound (c) having an amino group and one or more hydroxy groups
Data Source
AI summary
Provided is a solid electrolytic capacitor which retains a high capacitance and a low ESR and has high heat resistance. The solid electrolytic capacitor (10) is obtained by winding a porous anode foil (11) having a dielectric layer formed thereon and a cathode foil (14) together with separators (15) each interposed therebetween, the separators (15) having a solid electrolyte (13) supported thereon. Each layer of the solid electrolyte comprises a conductive composite (a) of a cationized conductive polymer with a polymer anion, a first hydroxy compound (b) having four or more hydroxy groups, and a second hydroxy compound (c) having an amino group and one or more hydroxy groups, the content of the conductive composite (a), in terms of mass proportion, being lower than that of the first hydroxy compound (b) and higher than that of the second hydroxy compound (c).